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Error code reference

Miele Oven Error Code F194

Bottom heat Pt1000 temperature sensor (R30/22) or wiring harness open-circuited.

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Bottom heat Pt1000 temperature sensor (R30/22) or wiring harness open-circuited.

First step from the service manual

Check the wiring harness.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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  • Wiring diagram references and connector pinouts from the OEM service manual
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What F194 means on a Miele oven

Error code F194 on a Miele oven indicates an open circuit condition in the bottom heat Pt1000 temperature sensor circuit, specifically component R30/22, or in the wiring harness that connects it to the control board. A Pt1000 sensor is a platinum resistance temperature detector (RTD) with a nominal resistance of 1000 ohms at 0 degrees Celsius. The control board continuously monitors the resistance of this sensor to calculate the temperature at the bottom heating element. When the circuit reads as open (infinite resistance), the board cannot obtain a valid temperature reading and triggers F194 to prevent unsafe operation.

The bottom heat sensor R30/22 is responsible for monitoring the temperature of the lower heating zone in the oven cavity. This data is critical for accurate baking and roasting functions that rely on bottom heat. An open circuit means the electrical path between the sensor and the control board is completely broken, which can result from a failed sensor element, a broken wire in the harness, a corroded or disconnected connector, or a damaged terminal that has lost continuity.

Diagnosis begins with inspecting the wiring harness routed from the sensor location to the control board. Technicians should check all connectors for corrosion, heat damage, or loose seating. If the harness checks out, the sensor itself can be tested with a multimeter: a functional Pt1000 sensor should read approximately 1000 ohms at room temperature. A reading of infinite resistance confirms a failed sensor element requiring replacement.

Source: manufacturer service documentation.

Common causes of F194

  1. 01

    Broken or disconnected wiring harness

    Part replacement

    A wire in the harness connecting sensor R30/22 to the control board may have broken due to repeated heat cycling, physical stress, or abrasion. Inspect the full harness run for visible breaks, melted insulation, or loose connector pins.

  2. 02

    Failed Pt1000 temperature sensor (R30/22)

    Part replacement

    The platinum sensing element inside the sensor can fail open, especially after prolonged exposure to high temperatures. Testing with a multimeter should show approximately 1000 ohms at room temperature; an open reading confirms sensor failure.

  3. 03

    Corroded or unseated connector

    Wiring / connection

    The connector joining the sensor harness to the control board or the sensor itself may be corroded, burnt, or not fully seated, breaking electrical continuity. Disconnect and inspect each connector terminal for discoloration or oxidation.

  4. 04

    Heat-damaged wiring near the heating element

    Part replacement

    Wiring routed near the bottom heating element can suffer insulation damage or conductor failure from prolonged heat exposure. Look for discolored, brittle, or charred sections of the harness in the lower oven cavity.

See the test procedure for each cause

Frequently asked questions about F194

What does F194 mean on a Miele oven?
F194 indicates that the bottom heat Pt1000 temperature sensor (R30/22) or its wiring harness is open-circuited. This means the control board is receiving no signal from the sensor that monitors the lower heating zone. The oven cannot safely regulate bottom heat without this reading, so it shuts down and displays the fault code.
Can I fix F194 on my Miele oven myself?
A knowledgeable DIYer can start by checking the wiring harness and connectors for visible damage or loose connections, which sometimes resolves the fault without parts. Testing the Pt1000 sensor with a multimeter requires basic electrical knowledge and access to the sensor location. If the sensor itself has failed, replacing it involves disassembling part of the oven interior, which many owners prefer to leave to a certified technician.
Is it safe to use my Miele oven while F194 is displayed?
No, it is not safe to continue using the oven with F194 active. The fault means the control board cannot monitor bottom heat temperatures, which removes a key safeguard against overheating. Operating the oven in this condition risks uncontrolled temperature conditions and potential damage to the appliance.
Will resetting the oven clear the F194 error code?
A reset may temporarily clear the displayed code, but F194 will return as soon as the control board attempts to read the sensor again and detects the open circuit. The underlying wiring or sensor fault must be physically repaired before the error will clear permanently.
How much does it cost to repair a Miele oven F194 error?
Repair costs vary depending on what is at fault. If the issue is a loose or corroded connector, the cost may be limited to a service call fee, typically in the range of $100 to $200. If the Pt1000 sensor needs replacement, parts and labor together commonly range from $150 to $400 depending on the specific model and local labor rates. Wiring harness replacement can fall on the higher end of that range or beyond, depending on how much of the harness is affected.

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